name: Benchmark compare last release

on:
  push:
    branches:
      - main
  workflow_dispatch:

jobs:
  benchmark:
    name: Linux
    runs-on: ubuntu-latest
    env:
      ASV_DIR: "./asv_bench"
      CONDA_ENV_FILE: ci/requirements/environment.yml

    steps:
      # We need the full repo to avoid this issue
      # https://github.com/actions/checkout/issues/23
      - uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Set up conda environment
        uses: mamba-org/setup-micromamba@v2
        with:
          micromamba-version: "1.5.10-0"
          environment-file: ${{env.CONDA_ENV_FILE}}
          environment-name: xarray-tests
          cache-environment: true
          cache-environment-key: "${{runner.os}}-${{runner.arch}}-py${{env.PYTHON_VERSION}}-${{env.TODAY}}-${{hashFiles(env.CONDA_ENV_FILE)}}-benchmark"
          create-args: >-
            asv

      - name: "Get Previous tag"
        id: previoustag
        uses: "WyriHaximus/github-action-get-previous-tag@v1"
        # with:
        #   fallback: 1.0.0 # Optional fallback tag to use when no tag can be found

      - name: Run benchmarks
        shell: bash -l {0}
        id: benchmark
        env:
          OPENBLAS_NUM_THREADS: 1
          MKL_NUM_THREADS: 1
          OMP_NUM_THREADS: 1
          ASV_FACTOR: 1.5
          ASV_SKIP_SLOW: 1
        run: |
          set -x
          # ID this runner
          asv machine --yes
          echo "Baseline: ${{ steps.previoustag.outputs.tag }} "
          echo "Contender: ${{ github.sha }}"
          # Use mamba for env creation
          # export CONDA_EXE=$(which mamba)
          export CONDA_EXE=$(which conda)
          # Run benchmarks for current commit against base
          ASV_OPTIONS="--split --show-stderr --factor $ASV_FACTOR"
          asv continuous $ASV_OPTIONS ${{ steps.previoustag.outputs.tag }}  ${{ github.sha }} \
              | sed "/Traceback \|failed$\|PERFORMANCE DECREASED/ s/^/::error::/" \
              | tee benchmarks.log
          # Report and export results for subsequent steps
          if grep "Traceback \|failed\|PERFORMANCE DECREASED" benchmarks.log > /dev/null ; then
              exit 1
          fi
        working-directory: ${{ env.ASV_DIR }}

      - name: Add instructions to artifact
        if: always()
        run: |
          cp benchmarks/README_CI.md benchmarks.log .asv/results/
        working-directory: ${{ env.ASV_DIR }}

      - uses: actions/upload-artifact@v6
        if: always()
        with:
          name: asv-benchmark-results-${{ runner.os }}
          path: ${{ env.ASV_DIR }}/.asv/results
